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netlink: Rename pid to portid to avoid confusion
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / xfrm / xfrm_user.c
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <net/ah.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
33 #endif
34
35 static inline int aead_len(struct xfrm_algo_aead *alg)
36 {
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38 }
39
40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41 {
42 struct nlattr *rt = attrs[type];
43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
48 algp = nla_data(rt);
49 if (nla_len(rt) < xfrm_alg_len(algp))
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 case XFRMA_ALG_CRYPT:
55 case XFRMA_ALG_COMP:
56 break;
57
58 default:
59 return -EINVAL;
60 }
61
62 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
63 return 0;
64 }
65
66 static int verify_auth_trunc(struct nlattr **attrs)
67 {
68 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
69 struct xfrm_algo_auth *algp;
70
71 if (!rt)
72 return 0;
73
74 algp = nla_data(rt);
75 if (nla_len(rt) < xfrm_alg_auth_len(algp))
76 return -EINVAL;
77
78 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
79 return 0;
80 }
81
82 static int verify_aead(struct nlattr **attrs)
83 {
84 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
85 struct xfrm_algo_aead *algp;
86
87 if (!rt)
88 return 0;
89
90 algp = nla_data(rt);
91 if (nla_len(rt) < aead_len(algp))
92 return -EINVAL;
93
94 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
95 return 0;
96 }
97
98 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
99 xfrm_address_t **addrp)
100 {
101 struct nlattr *rt = attrs[type];
102
103 if (rt && addrp)
104 *addrp = nla_data(rt);
105 }
106
107 static inline int verify_sec_ctx_len(struct nlattr **attrs)
108 {
109 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
110 struct xfrm_user_sec_ctx *uctx;
111
112 if (!rt)
113 return 0;
114
115 uctx = nla_data(rt);
116 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 return -EINVAL;
118
119 return 0;
120 }
121
122 static inline int verify_replay(struct xfrm_usersa_info *p,
123 struct nlattr **attrs)
124 {
125 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
126
127 if ((p->flags & XFRM_STATE_ESN) && !rt)
128 return -EINVAL;
129
130 if (!rt)
131 return 0;
132
133 if (p->id.proto != IPPROTO_ESP)
134 return -EINVAL;
135
136 if (p->replay_window != 0)
137 return -EINVAL;
138
139 return 0;
140 }
141
142 static int verify_newsa_info(struct xfrm_usersa_info *p,
143 struct nlattr **attrs)
144 {
145 int err;
146
147 err = -EINVAL;
148 switch (p->family) {
149 case AF_INET:
150 break;
151
152 case AF_INET6:
153 #if IS_ENABLED(CONFIG_IPV6)
154 break;
155 #else
156 err = -EAFNOSUPPORT;
157 goto out;
158 #endif
159
160 default:
161 goto out;
162 }
163
164 err = -EINVAL;
165 switch (p->id.proto) {
166 case IPPROTO_AH:
167 if ((!attrs[XFRMA_ALG_AUTH] &&
168 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
169 attrs[XFRMA_ALG_AEAD] ||
170 attrs[XFRMA_ALG_CRYPT] ||
171 attrs[XFRMA_ALG_COMP] ||
172 attrs[XFRMA_TFCPAD])
173 goto out;
174 break;
175
176 case IPPROTO_ESP:
177 if (attrs[XFRMA_ALG_COMP])
178 goto out;
179 if (!attrs[XFRMA_ALG_AUTH] &&
180 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
181 !attrs[XFRMA_ALG_CRYPT] &&
182 !attrs[XFRMA_ALG_AEAD])
183 goto out;
184 if ((attrs[XFRMA_ALG_AUTH] ||
185 attrs[XFRMA_ALG_AUTH_TRUNC] ||
186 attrs[XFRMA_ALG_CRYPT]) &&
187 attrs[XFRMA_ALG_AEAD])
188 goto out;
189 if (attrs[XFRMA_TFCPAD] &&
190 p->mode != XFRM_MODE_TUNNEL)
191 goto out;
192 break;
193
194 case IPPROTO_COMP:
195 if (!attrs[XFRMA_ALG_COMP] ||
196 attrs[XFRMA_ALG_AEAD] ||
197 attrs[XFRMA_ALG_AUTH] ||
198 attrs[XFRMA_ALG_AUTH_TRUNC] ||
199 attrs[XFRMA_ALG_CRYPT] ||
200 attrs[XFRMA_TFCPAD])
201 goto out;
202 break;
203
204 #if IS_ENABLED(CONFIG_IPV6)
205 case IPPROTO_DSTOPTS:
206 case IPPROTO_ROUTING:
207 if (attrs[XFRMA_ALG_COMP] ||
208 attrs[XFRMA_ALG_AUTH] ||
209 attrs[XFRMA_ALG_AUTH_TRUNC] ||
210 attrs[XFRMA_ALG_AEAD] ||
211 attrs[XFRMA_ALG_CRYPT] ||
212 attrs[XFRMA_ENCAP] ||
213 attrs[XFRMA_SEC_CTX] ||
214 attrs[XFRMA_TFCPAD] ||
215 !attrs[XFRMA_COADDR])
216 goto out;
217 break;
218 #endif
219
220 default:
221 goto out;
222 }
223
224 if ((err = verify_aead(attrs)))
225 goto out;
226 if ((err = verify_auth_trunc(attrs)))
227 goto out;
228 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
229 goto out;
230 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
231 goto out;
232 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
233 goto out;
234 if ((err = verify_sec_ctx_len(attrs)))
235 goto out;
236 if ((err = verify_replay(p, attrs)))
237 goto out;
238
239 err = -EINVAL;
240 switch (p->mode) {
241 case XFRM_MODE_TRANSPORT:
242 case XFRM_MODE_TUNNEL:
243 case XFRM_MODE_ROUTEOPTIMIZATION:
244 case XFRM_MODE_BEET:
245 break;
246
247 default:
248 goto out;
249 }
250
251 err = 0;
252
253 out:
254 return err;
255 }
256
257 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
258 struct xfrm_algo_desc *(*get_byname)(const char *, int),
259 struct nlattr *rta)
260 {
261 struct xfrm_algo *p, *ualg;
262 struct xfrm_algo_desc *algo;
263
264 if (!rta)
265 return 0;
266
267 ualg = nla_data(rta);
268
269 algo = get_byname(ualg->alg_name, 1);
270 if (!algo)
271 return -ENOSYS;
272 *props = algo->desc.sadb_alg_id;
273
274 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
275 if (!p)
276 return -ENOMEM;
277
278 strcpy(p->alg_name, algo->name);
279 *algpp = p;
280 return 0;
281 }
282
283 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
284 struct nlattr *rta)
285 {
286 struct xfrm_algo *ualg;
287 struct xfrm_algo_auth *p;
288 struct xfrm_algo_desc *algo;
289
290 if (!rta)
291 return 0;
292
293 ualg = nla_data(rta);
294
295 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
296 if (!algo)
297 return -ENOSYS;
298 *props = algo->desc.sadb_alg_id;
299
300 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303
304 strcpy(p->alg_name, algo->name);
305 p->alg_key_len = ualg->alg_key_len;
306 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
307 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
308
309 *algpp = p;
310 return 0;
311 }
312
313 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
314 struct nlattr *rta)
315 {
316 struct xfrm_algo_auth *p, *ualg;
317 struct xfrm_algo_desc *algo;
318
319 if (!rta)
320 return 0;
321
322 ualg = nla_data(rta);
323
324 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
325 if (!algo)
326 return -ENOSYS;
327 if ((ualg->alg_trunc_len / 8) > MAX_AH_AUTH_LEN ||
328 ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
329 return -EINVAL;
330 *props = algo->desc.sadb_alg_id;
331
332 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
333 if (!p)
334 return -ENOMEM;
335
336 strcpy(p->alg_name, algo->name);
337 if (!p->alg_trunc_len)
338 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
339
340 *algpp = p;
341 return 0;
342 }
343
344 static int attach_aead(struct xfrm_algo_aead **algpp, u8 *props,
345 struct nlattr *rta)
346 {
347 struct xfrm_algo_aead *p, *ualg;
348 struct xfrm_algo_desc *algo;
349
350 if (!rta)
351 return 0;
352
353 ualg = nla_data(rta);
354
355 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
356 if (!algo)
357 return -ENOSYS;
358 *props = algo->desc.sadb_alg_id;
359
360 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
361 if (!p)
362 return -ENOMEM;
363
364 strcpy(p->alg_name, algo->name);
365 *algpp = p;
366 return 0;
367 }
368
369 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
370 struct nlattr *rp)
371 {
372 struct xfrm_replay_state_esn *up;
373
374 if (!replay_esn || !rp)
375 return 0;
376
377 up = nla_data(rp);
378
379 if (xfrm_replay_state_esn_len(replay_esn) !=
380 xfrm_replay_state_esn_len(up))
381 return -EINVAL;
382
383 return 0;
384 }
385
386 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
387 struct xfrm_replay_state_esn **preplay_esn,
388 struct nlattr *rta)
389 {
390 struct xfrm_replay_state_esn *p, *pp, *up;
391
392 if (!rta)
393 return 0;
394
395 up = nla_data(rta);
396
397 p = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
398 if (!p)
399 return -ENOMEM;
400
401 pp = kmemdup(up, xfrm_replay_state_esn_len(up), GFP_KERNEL);
402 if (!pp) {
403 kfree(p);
404 return -ENOMEM;
405 }
406
407 *replay_esn = p;
408 *preplay_esn = pp;
409
410 return 0;
411 }
412
413 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
414 {
415 int len = 0;
416
417 if (xfrm_ctx) {
418 len += sizeof(struct xfrm_user_sec_ctx);
419 len += xfrm_ctx->ctx_len;
420 }
421 return len;
422 }
423
424 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
425 {
426 memcpy(&x->id, &p->id, sizeof(x->id));
427 memcpy(&x->sel, &p->sel, sizeof(x->sel));
428 memcpy(&x->lft, &p->lft, sizeof(x->lft));
429 x->props.mode = p->mode;
430 x->props.replay_window = p->replay_window;
431 x->props.reqid = p->reqid;
432 x->props.family = p->family;
433 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
434 x->props.flags = p->flags;
435
436 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
437 x->sel.family = p->family;
438 }
439
440 /*
441 * someday when pfkey also has support, we could have the code
442 * somehow made shareable and move it to xfrm_state.c - JHS
443 *
444 */
445 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
446 {
447 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
448 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
449 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
450 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
451 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
452
453 if (re) {
454 struct xfrm_replay_state_esn *replay_esn;
455 replay_esn = nla_data(re);
456 memcpy(x->replay_esn, replay_esn,
457 xfrm_replay_state_esn_len(replay_esn));
458 memcpy(x->preplay_esn, replay_esn,
459 xfrm_replay_state_esn_len(replay_esn));
460 }
461
462 if (rp) {
463 struct xfrm_replay_state *replay;
464 replay = nla_data(rp);
465 memcpy(&x->replay, replay, sizeof(*replay));
466 memcpy(&x->preplay, replay, sizeof(*replay));
467 }
468
469 if (lt) {
470 struct xfrm_lifetime_cur *ltime;
471 ltime = nla_data(lt);
472 x->curlft.bytes = ltime->bytes;
473 x->curlft.packets = ltime->packets;
474 x->curlft.add_time = ltime->add_time;
475 x->curlft.use_time = ltime->use_time;
476 }
477
478 if (et)
479 x->replay_maxage = nla_get_u32(et);
480
481 if (rt)
482 x->replay_maxdiff = nla_get_u32(rt);
483 }
484
485 static struct xfrm_state *xfrm_state_construct(struct net *net,
486 struct xfrm_usersa_info *p,
487 struct nlattr **attrs,
488 int *errp)
489 {
490 struct xfrm_state *x = xfrm_state_alloc(net);
491 int err = -ENOMEM;
492
493 if (!x)
494 goto error_no_put;
495
496 copy_from_user_state(x, p);
497
498 if ((err = attach_aead(&x->aead, &x->props.ealgo,
499 attrs[XFRMA_ALG_AEAD])))
500 goto error;
501 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
502 attrs[XFRMA_ALG_AUTH_TRUNC])))
503 goto error;
504 if (!x->props.aalgo) {
505 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
506 attrs[XFRMA_ALG_AUTH])))
507 goto error;
508 }
509 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
510 xfrm_ealg_get_byname,
511 attrs[XFRMA_ALG_CRYPT])))
512 goto error;
513 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
514 xfrm_calg_get_byname,
515 attrs[XFRMA_ALG_COMP])))
516 goto error;
517
518 if (attrs[XFRMA_ENCAP]) {
519 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
520 sizeof(*x->encap), GFP_KERNEL);
521 if (x->encap == NULL)
522 goto error;
523 }
524
525 if (attrs[XFRMA_TFCPAD])
526 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
527
528 if (attrs[XFRMA_COADDR]) {
529 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
530 sizeof(*x->coaddr), GFP_KERNEL);
531 if (x->coaddr == NULL)
532 goto error;
533 }
534
535 xfrm_mark_get(attrs, &x->mark);
536
537 err = __xfrm_init_state(x, false);
538 if (err)
539 goto error;
540
541 if (attrs[XFRMA_SEC_CTX] &&
542 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
543 goto error;
544
545 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
546 attrs[XFRMA_REPLAY_ESN_VAL])))
547 goto error;
548
549 x->km.seq = p->seq;
550 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
551 /* sysctl_xfrm_aevent_etime is in 100ms units */
552 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
553
554 if ((err = xfrm_init_replay(x)))
555 goto error;
556
557 /* override default values from above */
558 xfrm_update_ae_params(x, attrs);
559
560 return x;
561
562 error:
563 x->km.state = XFRM_STATE_DEAD;
564 xfrm_state_put(x);
565 error_no_put:
566 *errp = err;
567 return NULL;
568 }
569
570 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
571 struct nlattr **attrs)
572 {
573 struct net *net = sock_net(skb->sk);
574 struct xfrm_usersa_info *p = nlmsg_data(nlh);
575 struct xfrm_state *x;
576 int err;
577 struct km_event c;
578 uid_t loginuid = audit_get_loginuid(current);
579 u32 sessionid = audit_get_sessionid(current);
580 u32 sid;
581
582 err = verify_newsa_info(p, attrs);
583 if (err)
584 return err;
585
586 x = xfrm_state_construct(net, p, attrs, &err);
587 if (!x)
588 return err;
589
590 xfrm_state_hold(x);
591 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
592 err = xfrm_state_add(x);
593 else
594 err = xfrm_state_update(x);
595
596 security_task_getsecid(current, &sid);
597 xfrm_audit_state_add(x, err ? 0 : 1, loginuid, sessionid, sid);
598
599 if (err < 0) {
600 x->km.state = XFRM_STATE_DEAD;
601 __xfrm_state_put(x);
602 goto out;
603 }
604
605 c.seq = nlh->nlmsg_seq;
606 c.portid = nlh->nlmsg_pid;
607 c.event = nlh->nlmsg_type;
608
609 km_state_notify(x, &c);
610 out:
611 xfrm_state_put(x);
612 return err;
613 }
614
615 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
616 struct xfrm_usersa_id *p,
617 struct nlattr **attrs,
618 int *errp)
619 {
620 struct xfrm_state *x = NULL;
621 struct xfrm_mark m;
622 int err;
623 u32 mark = xfrm_mark_get(attrs, &m);
624
625 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
626 err = -ESRCH;
627 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
628 } else {
629 xfrm_address_t *saddr = NULL;
630
631 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
632 if (!saddr) {
633 err = -EINVAL;
634 goto out;
635 }
636
637 err = -ESRCH;
638 x = xfrm_state_lookup_byaddr(net, mark,
639 &p->daddr, saddr,
640 p->proto, p->family);
641 }
642
643 out:
644 if (!x && errp)
645 *errp = err;
646 return x;
647 }
648
649 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
650 struct nlattr **attrs)
651 {
652 struct net *net = sock_net(skb->sk);
653 struct xfrm_state *x;
654 int err = -ESRCH;
655 struct km_event c;
656 struct xfrm_usersa_id *p = nlmsg_data(nlh);
657 uid_t loginuid = audit_get_loginuid(current);
658 u32 sessionid = audit_get_sessionid(current);
659 u32 sid;
660
661 x = xfrm_user_state_lookup(net, p, attrs, &err);
662 if (x == NULL)
663 return err;
664
665 if ((err = security_xfrm_state_delete(x)) != 0)
666 goto out;
667
668 if (xfrm_state_kern(x)) {
669 err = -EPERM;
670 goto out;
671 }
672
673 err = xfrm_state_delete(x);
674
675 if (err < 0)
676 goto out;
677
678 c.seq = nlh->nlmsg_seq;
679 c.portid = nlh->nlmsg_pid;
680 c.event = nlh->nlmsg_type;
681 km_state_notify(x, &c);
682
683 out:
684 security_task_getsecid(current, &sid);
685 xfrm_audit_state_delete(x, err ? 0 : 1, loginuid, sessionid, sid);
686 xfrm_state_put(x);
687 return err;
688 }
689
690 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
691 {
692 memcpy(&p->id, &x->id, sizeof(p->id));
693 memcpy(&p->sel, &x->sel, sizeof(p->sel));
694 memcpy(&p->lft, &x->lft, sizeof(p->lft));
695 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
696 memcpy(&p->stats, &x->stats, sizeof(p->stats));
697 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
698 p->mode = x->props.mode;
699 p->replay_window = x->props.replay_window;
700 p->reqid = x->props.reqid;
701 p->family = x->props.family;
702 p->flags = x->props.flags;
703 p->seq = x->km.seq;
704 }
705
706 struct xfrm_dump_info {
707 struct sk_buff *in_skb;
708 struct sk_buff *out_skb;
709 u32 nlmsg_seq;
710 u16 nlmsg_flags;
711 };
712
713 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
714 {
715 struct xfrm_user_sec_ctx *uctx;
716 struct nlattr *attr;
717 int ctx_size = sizeof(*uctx) + s->ctx_len;
718
719 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
720 if (attr == NULL)
721 return -EMSGSIZE;
722
723 uctx = nla_data(attr);
724 uctx->exttype = XFRMA_SEC_CTX;
725 uctx->len = ctx_size;
726 uctx->ctx_doi = s->ctx_doi;
727 uctx->ctx_alg = s->ctx_alg;
728 uctx->ctx_len = s->ctx_len;
729 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
730
731 return 0;
732 }
733
734 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
735 {
736 struct xfrm_algo *algo;
737 struct nlattr *nla;
738
739 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
740 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
741 if (!nla)
742 return -EMSGSIZE;
743
744 algo = nla_data(nla);
745 strcpy(algo->alg_name, auth->alg_name);
746 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
747 algo->alg_key_len = auth->alg_key_len;
748
749 return 0;
750 }
751
752 /* Don't change this without updating xfrm_sa_len! */
753 static int copy_to_user_state_extra(struct xfrm_state *x,
754 struct xfrm_usersa_info *p,
755 struct sk_buff *skb)
756 {
757 int ret = 0;
758
759 copy_to_user_state(x, p);
760
761 if (x->coaddr) {
762 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
763 if (ret)
764 goto out;
765 }
766 if (x->lastused) {
767 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
768 if (ret)
769 goto out;
770 }
771 if (x->aead) {
772 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
773 if (ret)
774 goto out;
775 }
776 if (x->aalg) {
777 ret = copy_to_user_auth(x->aalg, skb);
778 if (!ret)
779 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
780 xfrm_alg_auth_len(x->aalg), x->aalg);
781 if (ret)
782 goto out;
783 }
784 if (x->ealg) {
785 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
786 if (ret)
787 goto out;
788 }
789 if (x->calg) {
790 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
791 if (ret)
792 goto out;
793 }
794 if (x->encap) {
795 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
796 if (ret)
797 goto out;
798 }
799 if (x->tfcpad) {
800 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
801 if (ret)
802 goto out;
803 }
804 ret = xfrm_mark_put(skb, &x->mark);
805 if (ret)
806 goto out;
807 if (x->replay_esn) {
808 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
809 xfrm_replay_state_esn_len(x->replay_esn),
810 x->replay_esn);
811 if (ret)
812 goto out;
813 }
814 if (x->security)
815 ret = copy_sec_ctx(x->security, skb);
816 out:
817 return ret;
818 }
819
820 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
821 {
822 struct xfrm_dump_info *sp = ptr;
823 struct sk_buff *in_skb = sp->in_skb;
824 struct sk_buff *skb = sp->out_skb;
825 struct xfrm_usersa_info *p;
826 struct nlmsghdr *nlh;
827 int err;
828
829 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
830 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
831 if (nlh == NULL)
832 return -EMSGSIZE;
833
834 p = nlmsg_data(nlh);
835
836 err = copy_to_user_state_extra(x, p, skb);
837 if (err) {
838 nlmsg_cancel(skb, nlh);
839 return err;
840 }
841 nlmsg_end(skb, nlh);
842 return 0;
843 }
844
845 static int xfrm_dump_sa_done(struct netlink_callback *cb)
846 {
847 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
848 xfrm_state_walk_done(walk);
849 return 0;
850 }
851
852 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
853 {
854 struct net *net = sock_net(skb->sk);
855 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
856 struct xfrm_dump_info info;
857
858 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
859 sizeof(cb->args) - sizeof(cb->args[0]));
860
861 info.in_skb = cb->skb;
862 info.out_skb = skb;
863 info.nlmsg_seq = cb->nlh->nlmsg_seq;
864 info.nlmsg_flags = NLM_F_MULTI;
865
866 if (!cb->args[0]) {
867 cb->args[0] = 1;
868 xfrm_state_walk_init(walk, 0);
869 }
870
871 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
872
873 return skb->len;
874 }
875
876 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
877 struct xfrm_state *x, u32 seq)
878 {
879 struct xfrm_dump_info info;
880 struct sk_buff *skb;
881
882 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
883 if (!skb)
884 return ERR_PTR(-ENOMEM);
885
886 info.in_skb = in_skb;
887 info.out_skb = skb;
888 info.nlmsg_seq = seq;
889 info.nlmsg_flags = 0;
890
891 if (dump_one_state(x, 0, &info)) {
892 kfree_skb(skb);
893 return NULL;
894 }
895
896 return skb;
897 }
898
899 static inline size_t xfrm_spdinfo_msgsize(void)
900 {
901 return NLMSG_ALIGN(4)
902 + nla_total_size(sizeof(struct xfrmu_spdinfo))
903 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
904 }
905
906 static int build_spdinfo(struct sk_buff *skb, struct net *net,
907 u32 portid, u32 seq, u32 flags)
908 {
909 struct xfrmk_spdinfo si;
910 struct xfrmu_spdinfo spc;
911 struct xfrmu_spdhinfo sph;
912 struct nlmsghdr *nlh;
913 int err;
914 u32 *f;
915
916 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
917 if (nlh == NULL) /* shouldn't really happen ... */
918 return -EMSGSIZE;
919
920 f = nlmsg_data(nlh);
921 *f = flags;
922 xfrm_spd_getinfo(net, &si);
923 spc.incnt = si.incnt;
924 spc.outcnt = si.outcnt;
925 spc.fwdcnt = si.fwdcnt;
926 spc.inscnt = si.inscnt;
927 spc.outscnt = si.outscnt;
928 spc.fwdscnt = si.fwdscnt;
929 sph.spdhcnt = si.spdhcnt;
930 sph.spdhmcnt = si.spdhmcnt;
931
932 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
933 if (!err)
934 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
935 if (err) {
936 nlmsg_cancel(skb, nlh);
937 return err;
938 }
939
940 return nlmsg_end(skb, nlh);
941 }
942
943 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
944 struct nlattr **attrs)
945 {
946 struct net *net = sock_net(skb->sk);
947 struct sk_buff *r_skb;
948 u32 *flags = nlmsg_data(nlh);
949 u32 sportid = NETLINK_CB(skb).portid;
950 u32 seq = nlh->nlmsg_seq;
951
952 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
953 if (r_skb == NULL)
954 return -ENOMEM;
955
956 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
957 BUG();
958
959 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
960 }
961
962 static inline size_t xfrm_sadinfo_msgsize(void)
963 {
964 return NLMSG_ALIGN(4)
965 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
966 + nla_total_size(4); /* XFRMA_SAD_CNT */
967 }
968
969 static int build_sadinfo(struct sk_buff *skb, struct net *net,
970 u32 portid, u32 seq, u32 flags)
971 {
972 struct xfrmk_sadinfo si;
973 struct xfrmu_sadhinfo sh;
974 struct nlmsghdr *nlh;
975 int err;
976 u32 *f;
977
978 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
979 if (nlh == NULL) /* shouldn't really happen ... */
980 return -EMSGSIZE;
981
982 f = nlmsg_data(nlh);
983 *f = flags;
984 xfrm_sad_getinfo(net, &si);
985
986 sh.sadhmcnt = si.sadhmcnt;
987 sh.sadhcnt = si.sadhcnt;
988
989 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
990 if (!err)
991 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
992 if (err) {
993 nlmsg_cancel(skb, nlh);
994 return err;
995 }
996
997 return nlmsg_end(skb, nlh);
998 }
999
1000 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1001 struct nlattr **attrs)
1002 {
1003 struct net *net = sock_net(skb->sk);
1004 struct sk_buff *r_skb;
1005 u32 *flags = nlmsg_data(nlh);
1006 u32 sportid = NETLINK_CB(skb).portid;
1007 u32 seq = nlh->nlmsg_seq;
1008
1009 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1010 if (r_skb == NULL)
1011 return -ENOMEM;
1012
1013 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1014 BUG();
1015
1016 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1017 }
1018
1019 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1020 struct nlattr **attrs)
1021 {
1022 struct net *net = sock_net(skb->sk);
1023 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1024 struct xfrm_state *x;
1025 struct sk_buff *resp_skb;
1026 int err = -ESRCH;
1027
1028 x = xfrm_user_state_lookup(net, p, attrs, &err);
1029 if (x == NULL)
1030 goto out_noput;
1031
1032 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1033 if (IS_ERR(resp_skb)) {
1034 err = PTR_ERR(resp_skb);
1035 } else {
1036 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1037 }
1038 xfrm_state_put(x);
1039 out_noput:
1040 return err;
1041 }
1042
1043 static int verify_userspi_info(struct xfrm_userspi_info *p)
1044 {
1045 switch (p->info.id.proto) {
1046 case IPPROTO_AH:
1047 case IPPROTO_ESP:
1048 break;
1049
1050 case IPPROTO_COMP:
1051 /* IPCOMP spi is 16-bits. */
1052 if (p->max >= 0x10000)
1053 return -EINVAL;
1054 break;
1055
1056 default:
1057 return -EINVAL;
1058 }
1059
1060 if (p->min > p->max)
1061 return -EINVAL;
1062
1063 return 0;
1064 }
1065
1066 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1067 struct nlattr **attrs)
1068 {
1069 struct net *net = sock_net(skb->sk);
1070 struct xfrm_state *x;
1071 struct xfrm_userspi_info *p;
1072 struct sk_buff *resp_skb;
1073 xfrm_address_t *daddr;
1074 int family;
1075 int err;
1076 u32 mark;
1077 struct xfrm_mark m;
1078
1079 p = nlmsg_data(nlh);
1080 err = verify_userspi_info(p);
1081 if (err)
1082 goto out_noput;
1083
1084 family = p->info.family;
1085 daddr = &p->info.id.daddr;
1086
1087 x = NULL;
1088
1089 mark = xfrm_mark_get(attrs, &m);
1090 if (p->info.seq) {
1091 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1092 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
1093 xfrm_state_put(x);
1094 x = NULL;
1095 }
1096 }
1097
1098 if (!x)
1099 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1100 p->info.id.proto, daddr,
1101 &p->info.saddr, 1,
1102 family);
1103 err = -ENOENT;
1104 if (x == NULL)
1105 goto out_noput;
1106
1107 err = xfrm_alloc_spi(x, p->min, p->max);
1108 if (err)
1109 goto out;
1110
1111 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1112 if (IS_ERR(resp_skb)) {
1113 err = PTR_ERR(resp_skb);
1114 goto out;
1115 }
1116
1117 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1118
1119 out:
1120 xfrm_state_put(x);
1121 out_noput:
1122 return err;
1123 }
1124
1125 static int verify_policy_dir(u8 dir)
1126 {
1127 switch (dir) {
1128 case XFRM_POLICY_IN:
1129 case XFRM_POLICY_OUT:
1130 case XFRM_POLICY_FWD:
1131 break;
1132
1133 default:
1134 return -EINVAL;
1135 }
1136
1137 return 0;
1138 }
1139
1140 static int verify_policy_type(u8 type)
1141 {
1142 switch (type) {
1143 case XFRM_POLICY_TYPE_MAIN:
1144 #ifdef CONFIG_XFRM_SUB_POLICY
1145 case XFRM_POLICY_TYPE_SUB:
1146 #endif
1147 break;
1148
1149 default:
1150 return -EINVAL;
1151 }
1152
1153 return 0;
1154 }
1155
1156 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1157 {
1158 switch (p->share) {
1159 case XFRM_SHARE_ANY:
1160 case XFRM_SHARE_SESSION:
1161 case XFRM_SHARE_USER:
1162 case XFRM_SHARE_UNIQUE:
1163 break;
1164
1165 default:
1166 return -EINVAL;
1167 }
1168
1169 switch (p->action) {
1170 case XFRM_POLICY_ALLOW:
1171 case XFRM_POLICY_BLOCK:
1172 break;
1173
1174 default:
1175 return -EINVAL;
1176 }
1177
1178 switch (p->sel.family) {
1179 case AF_INET:
1180 break;
1181
1182 case AF_INET6:
1183 #if IS_ENABLED(CONFIG_IPV6)
1184 break;
1185 #else
1186 return -EAFNOSUPPORT;
1187 #endif
1188
1189 default:
1190 return -EINVAL;
1191 }
1192
1193 return verify_policy_dir(p->dir);
1194 }
1195
1196 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1197 {
1198 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1199 struct xfrm_user_sec_ctx *uctx;
1200
1201 if (!rt)
1202 return 0;
1203
1204 uctx = nla_data(rt);
1205 return security_xfrm_policy_alloc(&pol->security, uctx);
1206 }
1207
1208 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1209 int nr)
1210 {
1211 int i;
1212
1213 xp->xfrm_nr = nr;
1214 for (i = 0; i < nr; i++, ut++) {
1215 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1216
1217 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1218 memcpy(&t->saddr, &ut->saddr,
1219 sizeof(xfrm_address_t));
1220 t->reqid = ut->reqid;
1221 t->mode = ut->mode;
1222 t->share = ut->share;
1223 t->optional = ut->optional;
1224 t->aalgos = ut->aalgos;
1225 t->ealgos = ut->ealgos;
1226 t->calgos = ut->calgos;
1227 /* If all masks are ~0, then we allow all algorithms. */
1228 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1229 t->encap_family = ut->family;
1230 }
1231 }
1232
1233 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1234 {
1235 int i;
1236
1237 if (nr > XFRM_MAX_DEPTH)
1238 return -EINVAL;
1239
1240 for (i = 0; i < nr; i++) {
1241 /* We never validated the ut->family value, so many
1242 * applications simply leave it at zero. The check was
1243 * never made and ut->family was ignored because all
1244 * templates could be assumed to have the same family as
1245 * the policy itself. Now that we will have ipv4-in-ipv6
1246 * and ipv6-in-ipv4 tunnels, this is no longer true.
1247 */
1248 if (!ut[i].family)
1249 ut[i].family = family;
1250
1251 switch (ut[i].family) {
1252 case AF_INET:
1253 break;
1254 #if IS_ENABLED(CONFIG_IPV6)
1255 case AF_INET6:
1256 break;
1257 #endif
1258 default:
1259 return -EINVAL;
1260 }
1261 }
1262
1263 return 0;
1264 }
1265
1266 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1267 {
1268 struct nlattr *rt = attrs[XFRMA_TMPL];
1269
1270 if (!rt) {
1271 pol->xfrm_nr = 0;
1272 } else {
1273 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1274 int nr = nla_len(rt) / sizeof(*utmpl);
1275 int err;
1276
1277 err = validate_tmpl(nr, utmpl, pol->family);
1278 if (err)
1279 return err;
1280
1281 copy_templates(pol, utmpl, nr);
1282 }
1283 return 0;
1284 }
1285
1286 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1287 {
1288 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1289 struct xfrm_userpolicy_type *upt;
1290 u8 type = XFRM_POLICY_TYPE_MAIN;
1291 int err;
1292
1293 if (rt) {
1294 upt = nla_data(rt);
1295 type = upt->type;
1296 }
1297
1298 err = verify_policy_type(type);
1299 if (err)
1300 return err;
1301
1302 *tp = type;
1303 return 0;
1304 }
1305
1306 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1307 {
1308 xp->priority = p->priority;
1309 xp->index = p->index;
1310 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1311 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1312 xp->action = p->action;
1313 xp->flags = p->flags;
1314 xp->family = p->sel.family;
1315 /* XXX xp->share = p->share; */
1316 }
1317
1318 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1319 {
1320 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1321 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1322 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1323 p->priority = xp->priority;
1324 p->index = xp->index;
1325 p->sel.family = xp->family;
1326 p->dir = dir;
1327 p->action = xp->action;
1328 p->flags = xp->flags;
1329 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1330 }
1331
1332 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1333 {
1334 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1335 int err;
1336
1337 if (!xp) {
1338 *errp = -ENOMEM;
1339 return NULL;
1340 }
1341
1342 copy_from_user_policy(xp, p);
1343
1344 err = copy_from_user_policy_type(&xp->type, attrs);
1345 if (err)
1346 goto error;
1347
1348 if (!(err = copy_from_user_tmpl(xp, attrs)))
1349 err = copy_from_user_sec_ctx(xp, attrs);
1350 if (err)
1351 goto error;
1352
1353 xfrm_mark_get(attrs, &xp->mark);
1354
1355 return xp;
1356 error:
1357 *errp = err;
1358 xp->walk.dead = 1;
1359 xfrm_policy_destroy(xp);
1360 return NULL;
1361 }
1362
1363 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1364 struct nlattr **attrs)
1365 {
1366 struct net *net = sock_net(skb->sk);
1367 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1368 struct xfrm_policy *xp;
1369 struct km_event c;
1370 int err;
1371 int excl;
1372 uid_t loginuid = audit_get_loginuid(current);
1373 u32 sessionid = audit_get_sessionid(current);
1374 u32 sid;
1375
1376 err = verify_newpolicy_info(p);
1377 if (err)
1378 return err;
1379 err = verify_sec_ctx_len(attrs);
1380 if (err)
1381 return err;
1382
1383 xp = xfrm_policy_construct(net, p, attrs, &err);
1384 if (!xp)
1385 return err;
1386
1387 /* shouldn't excl be based on nlh flags??
1388 * Aha! this is anti-netlink really i.e more pfkey derived
1389 * in netlink excl is a flag and you wouldnt need
1390 * a type XFRM_MSG_UPDPOLICY - JHS */
1391 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1392 err = xfrm_policy_insert(p->dir, xp, excl);
1393 security_task_getsecid(current, &sid);
1394 xfrm_audit_policy_add(xp, err ? 0 : 1, loginuid, sessionid, sid);
1395
1396 if (err) {
1397 security_xfrm_policy_free(xp->security);
1398 kfree(xp);
1399 return err;
1400 }
1401
1402 c.event = nlh->nlmsg_type;
1403 c.seq = nlh->nlmsg_seq;
1404 c.portid = nlh->nlmsg_pid;
1405 km_policy_notify(xp, p->dir, &c);
1406
1407 xfrm_pol_put(xp);
1408
1409 return 0;
1410 }
1411
1412 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1413 {
1414 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1415 int i;
1416
1417 if (xp->xfrm_nr == 0)
1418 return 0;
1419
1420 for (i = 0; i < xp->xfrm_nr; i++) {
1421 struct xfrm_user_tmpl *up = &vec[i];
1422 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1423
1424 memcpy(&up->id, &kp->id, sizeof(up->id));
1425 up->family = kp->encap_family;
1426 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1427 up->reqid = kp->reqid;
1428 up->mode = kp->mode;
1429 up->share = kp->share;
1430 up->optional = kp->optional;
1431 up->aalgos = kp->aalgos;
1432 up->ealgos = kp->ealgos;
1433 up->calgos = kp->calgos;
1434 }
1435
1436 return nla_put(skb, XFRMA_TMPL,
1437 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1438 }
1439
1440 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1441 {
1442 if (x->security) {
1443 return copy_sec_ctx(x->security, skb);
1444 }
1445 return 0;
1446 }
1447
1448 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1449 {
1450 if (xp->security)
1451 return copy_sec_ctx(xp->security, skb);
1452 return 0;
1453 }
1454 static inline size_t userpolicy_type_attrsize(void)
1455 {
1456 #ifdef CONFIG_XFRM_SUB_POLICY
1457 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1458 #else
1459 return 0;
1460 #endif
1461 }
1462
1463 #ifdef CONFIG_XFRM_SUB_POLICY
1464 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1465 {
1466 struct xfrm_userpolicy_type upt = {
1467 .type = type,
1468 };
1469
1470 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1471 }
1472
1473 #else
1474 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1475 {
1476 return 0;
1477 }
1478 #endif
1479
1480 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1481 {
1482 struct xfrm_dump_info *sp = ptr;
1483 struct xfrm_userpolicy_info *p;
1484 struct sk_buff *in_skb = sp->in_skb;
1485 struct sk_buff *skb = sp->out_skb;
1486 struct nlmsghdr *nlh;
1487 int err;
1488
1489 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1490 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1491 if (nlh == NULL)
1492 return -EMSGSIZE;
1493
1494 p = nlmsg_data(nlh);
1495 copy_to_user_policy(xp, p, dir);
1496 err = copy_to_user_tmpl(xp, skb);
1497 if (!err)
1498 err = copy_to_user_sec_ctx(xp, skb);
1499 if (!err)
1500 err = copy_to_user_policy_type(xp->type, skb);
1501 if (!err)
1502 err = xfrm_mark_put(skb, &xp->mark);
1503 if (err) {
1504 nlmsg_cancel(skb, nlh);
1505 return err;
1506 }
1507 nlmsg_end(skb, nlh);
1508 return 0;
1509 }
1510
1511 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1512 {
1513 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1514
1515 xfrm_policy_walk_done(walk);
1516 return 0;
1517 }
1518
1519 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1520 {
1521 struct net *net = sock_net(skb->sk);
1522 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1523 struct xfrm_dump_info info;
1524
1525 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1526 sizeof(cb->args) - sizeof(cb->args[0]));
1527
1528 info.in_skb = cb->skb;
1529 info.out_skb = skb;
1530 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1531 info.nlmsg_flags = NLM_F_MULTI;
1532
1533 if (!cb->args[0]) {
1534 cb->args[0] = 1;
1535 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1536 }
1537
1538 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1539
1540 return skb->len;
1541 }
1542
1543 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1544 struct xfrm_policy *xp,
1545 int dir, u32 seq)
1546 {
1547 struct xfrm_dump_info info;
1548 struct sk_buff *skb;
1549
1550 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1551 if (!skb)
1552 return ERR_PTR(-ENOMEM);
1553
1554 info.in_skb = in_skb;
1555 info.out_skb = skb;
1556 info.nlmsg_seq = seq;
1557 info.nlmsg_flags = 0;
1558
1559 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1560 kfree_skb(skb);
1561 return NULL;
1562 }
1563
1564 return skb;
1565 }
1566
1567 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1568 struct nlattr **attrs)
1569 {
1570 struct net *net = sock_net(skb->sk);
1571 struct xfrm_policy *xp;
1572 struct xfrm_userpolicy_id *p;
1573 u8 type = XFRM_POLICY_TYPE_MAIN;
1574 int err;
1575 struct km_event c;
1576 int delete;
1577 struct xfrm_mark m;
1578 u32 mark = xfrm_mark_get(attrs, &m);
1579
1580 p = nlmsg_data(nlh);
1581 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1582
1583 err = copy_from_user_policy_type(&type, attrs);
1584 if (err)
1585 return err;
1586
1587 err = verify_policy_dir(p->dir);
1588 if (err)
1589 return err;
1590
1591 if (p->index)
1592 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1593 else {
1594 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1595 struct xfrm_sec_ctx *ctx;
1596
1597 err = verify_sec_ctx_len(attrs);
1598 if (err)
1599 return err;
1600
1601 ctx = NULL;
1602 if (rt) {
1603 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1604
1605 err = security_xfrm_policy_alloc(&ctx, uctx);
1606 if (err)
1607 return err;
1608 }
1609 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1610 ctx, delete, &err);
1611 security_xfrm_policy_free(ctx);
1612 }
1613 if (xp == NULL)
1614 return -ENOENT;
1615
1616 if (!delete) {
1617 struct sk_buff *resp_skb;
1618
1619 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1620 if (IS_ERR(resp_skb)) {
1621 err = PTR_ERR(resp_skb);
1622 } else {
1623 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1624 NETLINK_CB(skb).portid);
1625 }
1626 } else {
1627 uid_t loginuid = audit_get_loginuid(current);
1628 u32 sessionid = audit_get_sessionid(current);
1629 u32 sid;
1630
1631 security_task_getsecid(current, &sid);
1632 xfrm_audit_policy_delete(xp, err ? 0 : 1, loginuid, sessionid,
1633 sid);
1634
1635 if (err != 0)
1636 goto out;
1637
1638 c.data.byid = p->index;
1639 c.event = nlh->nlmsg_type;
1640 c.seq = nlh->nlmsg_seq;
1641 c.portid = nlh->nlmsg_pid;
1642 km_policy_notify(xp, p->dir, &c);
1643 }
1644
1645 out:
1646 xfrm_pol_put(xp);
1647 return err;
1648 }
1649
1650 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1651 struct nlattr **attrs)
1652 {
1653 struct net *net = sock_net(skb->sk);
1654 struct km_event c;
1655 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1656 struct xfrm_audit audit_info;
1657 int err;
1658
1659 audit_info.loginuid = audit_get_loginuid(current);
1660 audit_info.sessionid = audit_get_sessionid(current);
1661 security_task_getsecid(current, &audit_info.secid);
1662 err = xfrm_state_flush(net, p->proto, &audit_info);
1663 if (err) {
1664 if (err == -ESRCH) /* empty table */
1665 return 0;
1666 return err;
1667 }
1668 c.data.proto = p->proto;
1669 c.event = nlh->nlmsg_type;
1670 c.seq = nlh->nlmsg_seq;
1671 c.portid = nlh->nlmsg_pid;
1672 c.net = net;
1673 km_state_notify(NULL, &c);
1674
1675 return 0;
1676 }
1677
1678 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1679 {
1680 size_t replay_size = x->replay_esn ?
1681 xfrm_replay_state_esn_len(x->replay_esn) :
1682 sizeof(struct xfrm_replay_state);
1683
1684 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1685 + nla_total_size(replay_size)
1686 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1687 + nla_total_size(sizeof(struct xfrm_mark))
1688 + nla_total_size(4) /* XFRM_AE_RTHR */
1689 + nla_total_size(4); /* XFRM_AE_ETHR */
1690 }
1691
1692 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1693 {
1694 struct xfrm_aevent_id *id;
1695 struct nlmsghdr *nlh;
1696 int err;
1697
1698 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1699 if (nlh == NULL)
1700 return -EMSGSIZE;
1701
1702 id = nlmsg_data(nlh);
1703 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1704 id->sa_id.spi = x->id.spi;
1705 id->sa_id.family = x->props.family;
1706 id->sa_id.proto = x->id.proto;
1707 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1708 id->reqid = x->props.reqid;
1709 id->flags = c->data.aevent;
1710
1711 if (x->replay_esn) {
1712 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1713 xfrm_replay_state_esn_len(x->replay_esn),
1714 x->replay_esn);
1715 } else {
1716 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1717 &x->replay);
1718 }
1719 if (err)
1720 goto out_cancel;
1721 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1722 if (err)
1723 goto out_cancel;
1724
1725 if (id->flags & XFRM_AE_RTHR) {
1726 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1727 if (err)
1728 goto out_cancel;
1729 }
1730 if (id->flags & XFRM_AE_ETHR) {
1731 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1732 x->replay_maxage * 10 / HZ);
1733 if (err)
1734 goto out_cancel;
1735 }
1736 err = xfrm_mark_put(skb, &x->mark);
1737 if (err)
1738 goto out_cancel;
1739
1740 return nlmsg_end(skb, nlh);
1741
1742 out_cancel:
1743 nlmsg_cancel(skb, nlh);
1744 return err;
1745 }
1746
1747 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1748 struct nlattr **attrs)
1749 {
1750 struct net *net = sock_net(skb->sk);
1751 struct xfrm_state *x;
1752 struct sk_buff *r_skb;
1753 int err;
1754 struct km_event c;
1755 u32 mark;
1756 struct xfrm_mark m;
1757 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1758 struct xfrm_usersa_id *id = &p->sa_id;
1759
1760 mark = xfrm_mark_get(attrs, &m);
1761
1762 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1763 if (x == NULL)
1764 return -ESRCH;
1765
1766 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1767 if (r_skb == NULL) {
1768 xfrm_state_put(x);
1769 return -ENOMEM;
1770 }
1771
1772 /*
1773 * XXX: is this lock really needed - none of the other
1774 * gets lock (the concern is things getting updated
1775 * while we are still reading) - jhs
1776 */
1777 spin_lock_bh(&x->lock);
1778 c.data.aevent = p->flags;
1779 c.seq = nlh->nlmsg_seq;
1780 c.portid = nlh->nlmsg_pid;
1781
1782 if (build_aevent(r_skb, x, &c) < 0)
1783 BUG();
1784 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1785 spin_unlock_bh(&x->lock);
1786 xfrm_state_put(x);
1787 return err;
1788 }
1789
1790 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1791 struct nlattr **attrs)
1792 {
1793 struct net *net = sock_net(skb->sk);
1794 struct xfrm_state *x;
1795 struct km_event c;
1796 int err = - EINVAL;
1797 u32 mark = 0;
1798 struct xfrm_mark m;
1799 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1800 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1801 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1802 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1803
1804 if (!lt && !rp && !re)
1805 return err;
1806
1807 /* pedantic mode - thou shalt sayeth replaceth */
1808 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1809 return err;
1810
1811 mark = xfrm_mark_get(attrs, &m);
1812
1813 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1814 if (x == NULL)
1815 return -ESRCH;
1816
1817 if (x->km.state != XFRM_STATE_VALID)
1818 goto out;
1819
1820 err = xfrm_replay_verify_len(x->replay_esn, rp);
1821 if (err)
1822 goto out;
1823
1824 spin_lock_bh(&x->lock);
1825 xfrm_update_ae_params(x, attrs);
1826 spin_unlock_bh(&x->lock);
1827
1828 c.event = nlh->nlmsg_type;
1829 c.seq = nlh->nlmsg_seq;
1830 c.portid = nlh->nlmsg_pid;
1831 c.data.aevent = XFRM_AE_CU;
1832 km_state_notify(x, &c);
1833 err = 0;
1834 out:
1835 xfrm_state_put(x);
1836 return err;
1837 }
1838
1839 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1840 struct nlattr **attrs)
1841 {
1842 struct net *net = sock_net(skb->sk);
1843 struct km_event c;
1844 u8 type = XFRM_POLICY_TYPE_MAIN;
1845 int err;
1846 struct xfrm_audit audit_info;
1847
1848 err = copy_from_user_policy_type(&type, attrs);
1849 if (err)
1850 return err;
1851
1852 audit_info.loginuid = audit_get_loginuid(current);
1853 audit_info.sessionid = audit_get_sessionid(current);
1854 security_task_getsecid(current, &audit_info.secid);
1855 err = xfrm_policy_flush(net, type, &audit_info);
1856 if (err) {
1857 if (err == -ESRCH) /* empty table */
1858 return 0;
1859 return err;
1860 }
1861
1862 c.data.type = type;
1863 c.event = nlh->nlmsg_type;
1864 c.seq = nlh->nlmsg_seq;
1865 c.portid = nlh->nlmsg_pid;
1866 c.net = net;
1867 km_policy_notify(NULL, 0, &c);
1868 return 0;
1869 }
1870
1871 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1872 struct nlattr **attrs)
1873 {
1874 struct net *net = sock_net(skb->sk);
1875 struct xfrm_policy *xp;
1876 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1877 struct xfrm_userpolicy_info *p = &up->pol;
1878 u8 type = XFRM_POLICY_TYPE_MAIN;
1879 int err = -ENOENT;
1880 struct xfrm_mark m;
1881 u32 mark = xfrm_mark_get(attrs, &m);
1882
1883 err = copy_from_user_policy_type(&type, attrs);
1884 if (err)
1885 return err;
1886
1887 err = verify_policy_dir(p->dir);
1888 if (err)
1889 return err;
1890
1891 if (p->index)
1892 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
1893 else {
1894 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1895 struct xfrm_sec_ctx *ctx;
1896
1897 err = verify_sec_ctx_len(attrs);
1898 if (err)
1899 return err;
1900
1901 ctx = NULL;
1902 if (rt) {
1903 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1904
1905 err = security_xfrm_policy_alloc(&ctx, uctx);
1906 if (err)
1907 return err;
1908 }
1909 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
1910 &p->sel, ctx, 0, &err);
1911 security_xfrm_policy_free(ctx);
1912 }
1913 if (xp == NULL)
1914 return -ENOENT;
1915
1916 if (unlikely(xp->walk.dead))
1917 goto out;
1918
1919 err = 0;
1920 if (up->hard) {
1921 uid_t loginuid = audit_get_loginuid(current);
1922 u32 sessionid = audit_get_sessionid(current);
1923 u32 sid;
1924
1925 security_task_getsecid(current, &sid);
1926 xfrm_policy_delete(xp, p->dir);
1927 xfrm_audit_policy_delete(xp, 1, loginuid, sessionid, sid);
1928
1929 } else {
1930 // reset the timers here?
1931 WARN(1, "Dont know what to do with soft policy expire\n");
1932 }
1933 km_policy_expired(xp, p->dir, up->hard, current->pid);
1934
1935 out:
1936 xfrm_pol_put(xp);
1937 return err;
1938 }
1939
1940 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1941 struct nlattr **attrs)
1942 {
1943 struct net *net = sock_net(skb->sk);
1944 struct xfrm_state *x;
1945 int err;
1946 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1947 struct xfrm_usersa_info *p = &ue->state;
1948 struct xfrm_mark m;
1949 u32 mark = xfrm_mark_get(attrs, &m);
1950
1951 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
1952
1953 err = -ENOENT;
1954 if (x == NULL)
1955 return err;
1956
1957 spin_lock_bh(&x->lock);
1958 err = -EINVAL;
1959 if (x->km.state != XFRM_STATE_VALID)
1960 goto out;
1961 km_state_expired(x, ue->hard, current->pid);
1962
1963 if (ue->hard) {
1964 uid_t loginuid = audit_get_loginuid(current);
1965 u32 sessionid = audit_get_sessionid(current);
1966 u32 sid;
1967
1968 security_task_getsecid(current, &sid);
1969 __xfrm_state_delete(x);
1970 xfrm_audit_state_delete(x, 1, loginuid, sessionid, sid);
1971 }
1972 err = 0;
1973 out:
1974 spin_unlock_bh(&x->lock);
1975 xfrm_state_put(x);
1976 return err;
1977 }
1978
1979 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1980 struct nlattr **attrs)
1981 {
1982 struct net *net = sock_net(skb->sk);
1983 struct xfrm_policy *xp;
1984 struct xfrm_user_tmpl *ut;
1985 int i;
1986 struct nlattr *rt = attrs[XFRMA_TMPL];
1987 struct xfrm_mark mark;
1988
1989 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1990 struct xfrm_state *x = xfrm_state_alloc(net);
1991 int err = -ENOMEM;
1992
1993 if (!x)
1994 goto nomem;
1995
1996 xfrm_mark_get(attrs, &mark);
1997
1998 err = verify_newpolicy_info(&ua->policy);
1999 if (err)
2000 goto bad_policy;
2001
2002 /* build an XP */
2003 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2004 if (!xp)
2005 goto free_state;
2006
2007 memcpy(&x->id, &ua->id, sizeof(ua->id));
2008 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2009 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2010 xp->mark.m = x->mark.m = mark.m;
2011 xp->mark.v = x->mark.v = mark.v;
2012 ut = nla_data(rt);
2013 /* extract the templates and for each call km_key */
2014 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2015 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2016 memcpy(&x->id, &t->id, sizeof(x->id));
2017 x->props.mode = t->mode;
2018 x->props.reqid = t->reqid;
2019 x->props.family = ut->family;
2020 t->aalgos = ua->aalgos;
2021 t->ealgos = ua->ealgos;
2022 t->calgos = ua->calgos;
2023 err = km_query(x, t, xp);
2024
2025 }
2026
2027 kfree(x);
2028 kfree(xp);
2029
2030 return 0;
2031
2032 bad_policy:
2033 WARN(1, "BAD policy passed\n");
2034 free_state:
2035 kfree(x);
2036 nomem:
2037 return err;
2038 }
2039
2040 #ifdef CONFIG_XFRM_MIGRATE
2041 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2042 struct xfrm_kmaddress *k,
2043 struct nlattr **attrs, int *num)
2044 {
2045 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2046 struct xfrm_user_migrate *um;
2047 int i, num_migrate;
2048
2049 if (k != NULL) {
2050 struct xfrm_user_kmaddress *uk;
2051
2052 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2053 memcpy(&k->local, &uk->local, sizeof(k->local));
2054 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2055 k->family = uk->family;
2056 k->reserved = uk->reserved;
2057 }
2058
2059 um = nla_data(rt);
2060 num_migrate = nla_len(rt) / sizeof(*um);
2061
2062 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2063 return -EINVAL;
2064
2065 for (i = 0; i < num_migrate; i++, um++, ma++) {
2066 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2067 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2068 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2069 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2070
2071 ma->proto = um->proto;
2072 ma->mode = um->mode;
2073 ma->reqid = um->reqid;
2074
2075 ma->old_family = um->old_family;
2076 ma->new_family = um->new_family;
2077 }
2078
2079 *num = i;
2080 return 0;
2081 }
2082
2083 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2084 struct nlattr **attrs)
2085 {
2086 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2087 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2088 struct xfrm_kmaddress km, *kmp;
2089 u8 type;
2090 int err;
2091 int n = 0;
2092
2093 if (attrs[XFRMA_MIGRATE] == NULL)
2094 return -EINVAL;
2095
2096 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2097
2098 err = copy_from_user_policy_type(&type, attrs);
2099 if (err)
2100 return err;
2101
2102 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2103 if (err)
2104 return err;
2105
2106 if (!n)
2107 return 0;
2108
2109 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp);
2110
2111 return 0;
2112 }
2113 #else
2114 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2115 struct nlattr **attrs)
2116 {
2117 return -ENOPROTOOPT;
2118 }
2119 #endif
2120
2121 #ifdef CONFIG_XFRM_MIGRATE
2122 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2123 {
2124 struct xfrm_user_migrate um;
2125
2126 memset(&um, 0, sizeof(um));
2127 um.proto = m->proto;
2128 um.mode = m->mode;
2129 um.reqid = m->reqid;
2130 um.old_family = m->old_family;
2131 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2132 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2133 um.new_family = m->new_family;
2134 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2135 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2136
2137 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2138 }
2139
2140 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2141 {
2142 struct xfrm_user_kmaddress uk;
2143
2144 memset(&uk, 0, sizeof(uk));
2145 uk.family = k->family;
2146 uk.reserved = k->reserved;
2147 memcpy(&uk.local, &k->local, sizeof(uk.local));
2148 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2149
2150 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2151 }
2152
2153 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2154 {
2155 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2156 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2157 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2158 + userpolicy_type_attrsize();
2159 }
2160
2161 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2162 int num_migrate, const struct xfrm_kmaddress *k,
2163 const struct xfrm_selector *sel, u8 dir, u8 type)
2164 {
2165 const struct xfrm_migrate *mp;
2166 struct xfrm_userpolicy_id *pol_id;
2167 struct nlmsghdr *nlh;
2168 int i, err;
2169
2170 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2171 if (nlh == NULL)
2172 return -EMSGSIZE;
2173
2174 pol_id = nlmsg_data(nlh);
2175 /* copy data from selector, dir, and type to the pol_id */
2176 memset(pol_id, 0, sizeof(*pol_id));
2177 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2178 pol_id->dir = dir;
2179
2180 if (k != NULL) {
2181 err = copy_to_user_kmaddress(k, skb);
2182 if (err)
2183 goto out_cancel;
2184 }
2185 err = copy_to_user_policy_type(type, skb);
2186 if (err)
2187 goto out_cancel;
2188 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2189 err = copy_to_user_migrate(mp, skb);
2190 if (err)
2191 goto out_cancel;
2192 }
2193
2194 return nlmsg_end(skb, nlh);
2195
2196 out_cancel:
2197 nlmsg_cancel(skb, nlh);
2198 return err;
2199 }
2200
2201 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2202 const struct xfrm_migrate *m, int num_migrate,
2203 const struct xfrm_kmaddress *k)
2204 {
2205 struct net *net = &init_net;
2206 struct sk_buff *skb;
2207
2208 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2209 if (skb == NULL)
2210 return -ENOMEM;
2211
2212 /* build migrate */
2213 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2214 BUG();
2215
2216 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
2217 }
2218 #else
2219 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2220 const struct xfrm_migrate *m, int num_migrate,
2221 const struct xfrm_kmaddress *k)
2222 {
2223 return -ENOPROTOOPT;
2224 }
2225 #endif
2226
2227 #define XMSGSIZE(type) sizeof(struct type)
2228
2229 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2230 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2231 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2232 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2233 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2234 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2235 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2236 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2237 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2238 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2239 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2240 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2241 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2242 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2243 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2244 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2245 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2246 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2247 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2248 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2249 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2250 };
2251
2252 #undef XMSGSIZE
2253
2254 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2255 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2256 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2257 [XFRMA_LASTUSED] = { .type = NLA_U64},
2258 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2259 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2260 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2261 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2262 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2263 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2264 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2265 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2266 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2267 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2268 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2269 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2270 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2271 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2272 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2273 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2274 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2275 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2276 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2277 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2278 };
2279
2280 static struct xfrm_link {
2281 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2282 int (*dump)(struct sk_buff *, struct netlink_callback *);
2283 int (*done)(struct netlink_callback *);
2284 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2285 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2286 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2287 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2288 .dump = xfrm_dump_sa,
2289 .done = xfrm_dump_sa_done },
2290 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2291 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2292 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2293 .dump = xfrm_dump_policy,
2294 .done = xfrm_dump_policy_done },
2295 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2296 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2297 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2298 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2299 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2300 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2301 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2302 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2303 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2304 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2305 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2306 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2307 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2308 };
2309
2310 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2311 {
2312 struct net *net = sock_net(skb->sk);
2313 struct nlattr *attrs[XFRMA_MAX+1];
2314 struct xfrm_link *link;
2315 int type, err;
2316
2317 type = nlh->nlmsg_type;
2318 if (type > XFRM_MSG_MAX)
2319 return -EINVAL;
2320
2321 type -= XFRM_MSG_BASE;
2322 link = &xfrm_dispatch[type];
2323
2324 /* All operations require privileges, even GET */
2325 if (!capable(CAP_NET_ADMIN))
2326 return -EPERM;
2327
2328 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2329 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2330 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2331 if (link->dump == NULL)
2332 return -EINVAL;
2333
2334 {
2335 struct netlink_dump_control c = {
2336 .dump = link->dump,
2337 .done = link->done,
2338 };
2339 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2340 }
2341 }
2342
2343 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
2344 xfrma_policy);
2345 if (err < 0)
2346 return err;
2347
2348 if (link->doit == NULL)
2349 return -EINVAL;
2350
2351 return link->doit(skb, nlh, attrs);
2352 }
2353
2354 static void xfrm_netlink_rcv(struct sk_buff *skb)
2355 {
2356 mutex_lock(&xfrm_cfg_mutex);
2357 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2358 mutex_unlock(&xfrm_cfg_mutex);
2359 }
2360
2361 static inline size_t xfrm_expire_msgsize(void)
2362 {
2363 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2364 + nla_total_size(sizeof(struct xfrm_mark));
2365 }
2366
2367 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2368 {
2369 struct xfrm_user_expire *ue;
2370 struct nlmsghdr *nlh;
2371 int err;
2372
2373 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2374 if (nlh == NULL)
2375 return -EMSGSIZE;
2376
2377 ue = nlmsg_data(nlh);
2378 copy_to_user_state(x, &ue->state);
2379 ue->hard = (c->data.hard != 0) ? 1 : 0;
2380
2381 err = xfrm_mark_put(skb, &x->mark);
2382 if (err)
2383 return err;
2384
2385 return nlmsg_end(skb, nlh);
2386 }
2387
2388 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2389 {
2390 struct net *net = xs_net(x);
2391 struct sk_buff *skb;
2392
2393 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2394 if (skb == NULL)
2395 return -ENOMEM;
2396
2397 if (build_expire(skb, x, c) < 0) {
2398 kfree_skb(skb);
2399 return -EMSGSIZE;
2400 }
2401
2402 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2403 }
2404
2405 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2406 {
2407 struct net *net = xs_net(x);
2408 struct sk_buff *skb;
2409
2410 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2411 if (skb == NULL)
2412 return -ENOMEM;
2413
2414 if (build_aevent(skb, x, c) < 0)
2415 BUG();
2416
2417 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
2418 }
2419
2420 static int xfrm_notify_sa_flush(const struct km_event *c)
2421 {
2422 struct net *net = c->net;
2423 struct xfrm_usersa_flush *p;
2424 struct nlmsghdr *nlh;
2425 struct sk_buff *skb;
2426 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2427
2428 skb = nlmsg_new(len, GFP_ATOMIC);
2429 if (skb == NULL)
2430 return -ENOMEM;
2431
2432 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2433 if (nlh == NULL) {
2434 kfree_skb(skb);
2435 return -EMSGSIZE;
2436 }
2437
2438 p = nlmsg_data(nlh);
2439 p->proto = c->data.proto;
2440
2441 nlmsg_end(skb, nlh);
2442
2443 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2444 }
2445
2446 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2447 {
2448 size_t l = 0;
2449 if (x->aead)
2450 l += nla_total_size(aead_len(x->aead));
2451 if (x->aalg) {
2452 l += nla_total_size(sizeof(struct xfrm_algo) +
2453 (x->aalg->alg_key_len + 7) / 8);
2454 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2455 }
2456 if (x->ealg)
2457 l += nla_total_size(xfrm_alg_len(x->ealg));
2458 if (x->calg)
2459 l += nla_total_size(sizeof(*x->calg));
2460 if (x->encap)
2461 l += nla_total_size(sizeof(*x->encap));
2462 if (x->tfcpad)
2463 l += nla_total_size(sizeof(x->tfcpad));
2464 if (x->replay_esn)
2465 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2466 if (x->security)
2467 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2468 x->security->ctx_len);
2469 if (x->coaddr)
2470 l += nla_total_size(sizeof(*x->coaddr));
2471
2472 /* Must count x->lastused as it may become non-zero behind our back. */
2473 l += nla_total_size(sizeof(u64));
2474
2475 return l;
2476 }
2477
2478 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2479 {
2480 struct net *net = xs_net(x);
2481 struct xfrm_usersa_info *p;
2482 struct xfrm_usersa_id *id;
2483 struct nlmsghdr *nlh;
2484 struct sk_buff *skb;
2485 int len = xfrm_sa_len(x);
2486 int headlen, err;
2487
2488 headlen = sizeof(*p);
2489 if (c->event == XFRM_MSG_DELSA) {
2490 len += nla_total_size(headlen);
2491 headlen = sizeof(*id);
2492 len += nla_total_size(sizeof(struct xfrm_mark));
2493 }
2494 len += NLMSG_ALIGN(headlen);
2495
2496 skb = nlmsg_new(len, GFP_ATOMIC);
2497 if (skb == NULL)
2498 return -ENOMEM;
2499
2500 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2501 err = -EMSGSIZE;
2502 if (nlh == NULL)
2503 goto out_free_skb;
2504
2505 p = nlmsg_data(nlh);
2506 if (c->event == XFRM_MSG_DELSA) {
2507 struct nlattr *attr;
2508
2509 id = nlmsg_data(nlh);
2510 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2511 id->spi = x->id.spi;
2512 id->family = x->props.family;
2513 id->proto = x->id.proto;
2514
2515 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2516 err = -EMSGSIZE;
2517 if (attr == NULL)
2518 goto out_free_skb;
2519
2520 p = nla_data(attr);
2521 }
2522 err = copy_to_user_state_extra(x, p, skb);
2523 if (err)
2524 goto out_free_skb;
2525
2526 nlmsg_end(skb, nlh);
2527
2528 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2529
2530 out_free_skb:
2531 kfree_skb(skb);
2532 return err;
2533 }
2534
2535 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2536 {
2537
2538 switch (c->event) {
2539 case XFRM_MSG_EXPIRE:
2540 return xfrm_exp_state_notify(x, c);
2541 case XFRM_MSG_NEWAE:
2542 return xfrm_aevent_state_notify(x, c);
2543 case XFRM_MSG_DELSA:
2544 case XFRM_MSG_UPDSA:
2545 case XFRM_MSG_NEWSA:
2546 return xfrm_notify_sa(x, c);
2547 case XFRM_MSG_FLUSHSA:
2548 return xfrm_notify_sa_flush(c);
2549 default:
2550 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2551 c->event);
2552 break;
2553 }
2554
2555 return 0;
2556
2557 }
2558
2559 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2560 struct xfrm_policy *xp)
2561 {
2562 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2563 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2564 + nla_total_size(sizeof(struct xfrm_mark))
2565 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2566 + userpolicy_type_attrsize();
2567 }
2568
2569 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2570 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2571 {
2572 __u32 seq = xfrm_get_acqseq();
2573 struct xfrm_user_acquire *ua;
2574 struct nlmsghdr *nlh;
2575 int err;
2576
2577 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2578 if (nlh == NULL)
2579 return -EMSGSIZE;
2580
2581 ua = nlmsg_data(nlh);
2582 memcpy(&ua->id, &x->id, sizeof(ua->id));
2583 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2584 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2585 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2586 ua->aalgos = xt->aalgos;
2587 ua->ealgos = xt->ealgos;
2588 ua->calgos = xt->calgos;
2589 ua->seq = x->km.seq = seq;
2590
2591 err = copy_to_user_tmpl(xp, skb);
2592 if (!err)
2593 err = copy_to_user_state_sec_ctx(x, skb);
2594 if (!err)
2595 err = copy_to_user_policy_type(xp->type, skb);
2596 if (!err)
2597 err = xfrm_mark_put(skb, &xp->mark);
2598 if (err) {
2599 nlmsg_cancel(skb, nlh);
2600 return err;
2601 }
2602
2603 return nlmsg_end(skb, nlh);
2604 }
2605
2606 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2607 struct xfrm_policy *xp)
2608 {
2609 struct net *net = xs_net(x);
2610 struct sk_buff *skb;
2611
2612 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2613 if (skb == NULL)
2614 return -ENOMEM;
2615
2616 if (build_acquire(skb, x, xt, xp) < 0)
2617 BUG();
2618
2619 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2620 }
2621
2622 /* User gives us xfrm_user_policy_info followed by an array of 0
2623 * or more templates.
2624 */
2625 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2626 u8 *data, int len, int *dir)
2627 {
2628 struct net *net = sock_net(sk);
2629 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2630 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2631 struct xfrm_policy *xp;
2632 int nr;
2633
2634 switch (sk->sk_family) {
2635 case AF_INET:
2636 if (opt != IP_XFRM_POLICY) {
2637 *dir = -EOPNOTSUPP;
2638 return NULL;
2639 }
2640 break;
2641 #if IS_ENABLED(CONFIG_IPV6)
2642 case AF_INET6:
2643 if (opt != IPV6_XFRM_POLICY) {
2644 *dir = -EOPNOTSUPP;
2645 return NULL;
2646 }
2647 break;
2648 #endif
2649 default:
2650 *dir = -EINVAL;
2651 return NULL;
2652 }
2653
2654 *dir = -EINVAL;
2655
2656 if (len < sizeof(*p) ||
2657 verify_newpolicy_info(p))
2658 return NULL;
2659
2660 nr = ((len - sizeof(*p)) / sizeof(*ut));
2661 if (validate_tmpl(nr, ut, p->sel.family))
2662 return NULL;
2663
2664 if (p->dir > XFRM_POLICY_OUT)
2665 return NULL;
2666
2667 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2668 if (xp == NULL) {
2669 *dir = -ENOBUFS;
2670 return NULL;
2671 }
2672
2673 copy_from_user_policy(xp, p);
2674 xp->type = XFRM_POLICY_TYPE_MAIN;
2675 copy_templates(xp, ut, nr);
2676
2677 *dir = p->dir;
2678
2679 return xp;
2680 }
2681
2682 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2683 {
2684 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2685 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2686 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2687 + nla_total_size(sizeof(struct xfrm_mark))
2688 + userpolicy_type_attrsize();
2689 }
2690
2691 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2692 int dir, const struct km_event *c)
2693 {
2694 struct xfrm_user_polexpire *upe;
2695 int hard = c->data.hard;
2696 struct nlmsghdr *nlh;
2697 int err;
2698
2699 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2700 if (nlh == NULL)
2701 return -EMSGSIZE;
2702
2703 upe = nlmsg_data(nlh);
2704 copy_to_user_policy(xp, &upe->pol, dir);
2705 err = copy_to_user_tmpl(xp, skb);
2706 if (!err)
2707 err = copy_to_user_sec_ctx(xp, skb);
2708 if (!err)
2709 err = copy_to_user_policy_type(xp->type, skb);
2710 if (!err)
2711 err = xfrm_mark_put(skb, &xp->mark);
2712 if (err) {
2713 nlmsg_cancel(skb, nlh);
2714 return err;
2715 }
2716 upe->hard = !!hard;
2717
2718 return nlmsg_end(skb, nlh);
2719 }
2720
2721 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2722 {
2723 struct net *net = xp_net(xp);
2724 struct sk_buff *skb;
2725
2726 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2727 if (skb == NULL)
2728 return -ENOMEM;
2729
2730 if (build_polexpire(skb, xp, dir, c) < 0)
2731 BUG();
2732
2733 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2734 }
2735
2736 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2737 {
2738 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2739 struct net *net = xp_net(xp);
2740 struct xfrm_userpolicy_info *p;
2741 struct xfrm_userpolicy_id *id;
2742 struct nlmsghdr *nlh;
2743 struct sk_buff *skb;
2744 int headlen, err;
2745
2746 headlen = sizeof(*p);
2747 if (c->event == XFRM_MSG_DELPOLICY) {
2748 len += nla_total_size(headlen);
2749 headlen = sizeof(*id);
2750 }
2751 len += userpolicy_type_attrsize();
2752 len += nla_total_size(sizeof(struct xfrm_mark));
2753 len += NLMSG_ALIGN(headlen);
2754
2755 skb = nlmsg_new(len, GFP_ATOMIC);
2756 if (skb == NULL)
2757 return -ENOMEM;
2758
2759 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2760 err = -EMSGSIZE;
2761 if (nlh == NULL)
2762 goto out_free_skb;
2763
2764 p = nlmsg_data(nlh);
2765 if (c->event == XFRM_MSG_DELPOLICY) {
2766 struct nlattr *attr;
2767
2768 id = nlmsg_data(nlh);
2769 memset(id, 0, sizeof(*id));
2770 id->dir = dir;
2771 if (c->data.byid)
2772 id->index = xp->index;
2773 else
2774 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2775
2776 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2777 err = -EMSGSIZE;
2778 if (attr == NULL)
2779 goto out_free_skb;
2780
2781 p = nla_data(attr);
2782 }
2783
2784 copy_to_user_policy(xp, p, dir);
2785 err = copy_to_user_tmpl(xp, skb);
2786 if (!err)
2787 err = copy_to_user_policy_type(xp->type, skb);
2788 if (!err)
2789 err = xfrm_mark_put(skb, &xp->mark);
2790 if (err)
2791 goto out_free_skb;
2792
2793 nlmsg_end(skb, nlh);
2794
2795 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2796
2797 out_free_skb:
2798 kfree_skb(skb);
2799 return err;
2800 }
2801
2802 static int xfrm_notify_policy_flush(const struct km_event *c)
2803 {
2804 struct net *net = c->net;
2805 struct nlmsghdr *nlh;
2806 struct sk_buff *skb;
2807 int err;
2808
2809 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2810 if (skb == NULL)
2811 return -ENOMEM;
2812
2813 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2814 err = -EMSGSIZE;
2815 if (nlh == NULL)
2816 goto out_free_skb;
2817 err = copy_to_user_policy_type(c->data.type, skb);
2818 if (err)
2819 goto out_free_skb;
2820
2821 nlmsg_end(skb, nlh);
2822
2823 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2824
2825 out_free_skb:
2826 kfree_skb(skb);
2827 return err;
2828 }
2829
2830 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2831 {
2832
2833 switch (c->event) {
2834 case XFRM_MSG_NEWPOLICY:
2835 case XFRM_MSG_UPDPOLICY:
2836 case XFRM_MSG_DELPOLICY:
2837 return xfrm_notify_policy(xp, dir, c);
2838 case XFRM_MSG_FLUSHPOLICY:
2839 return xfrm_notify_policy_flush(c);
2840 case XFRM_MSG_POLEXPIRE:
2841 return xfrm_exp_policy_notify(xp, dir, c);
2842 default:
2843 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2844 c->event);
2845 }
2846
2847 return 0;
2848
2849 }
2850
2851 static inline size_t xfrm_report_msgsize(void)
2852 {
2853 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2854 }
2855
2856 static int build_report(struct sk_buff *skb, u8 proto,
2857 struct xfrm_selector *sel, xfrm_address_t *addr)
2858 {
2859 struct xfrm_user_report *ur;
2860 struct nlmsghdr *nlh;
2861
2862 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2863 if (nlh == NULL)
2864 return -EMSGSIZE;
2865
2866 ur = nlmsg_data(nlh);
2867 ur->proto = proto;
2868 memcpy(&ur->sel, sel, sizeof(ur->sel));
2869
2870 if (addr) {
2871 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
2872 if (err) {
2873 nlmsg_cancel(skb, nlh);
2874 return err;
2875 }
2876 }
2877 return nlmsg_end(skb, nlh);
2878 }
2879
2880 static int xfrm_send_report(struct net *net, u8 proto,
2881 struct xfrm_selector *sel, xfrm_address_t *addr)
2882 {
2883 struct sk_buff *skb;
2884
2885 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2886 if (skb == NULL)
2887 return -ENOMEM;
2888
2889 if (build_report(skb, proto, sel, addr) < 0)
2890 BUG();
2891
2892 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2893 }
2894
2895 static inline size_t xfrm_mapping_msgsize(void)
2896 {
2897 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
2898 }
2899
2900 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
2901 xfrm_address_t *new_saddr, __be16 new_sport)
2902 {
2903 struct xfrm_user_mapping *um;
2904 struct nlmsghdr *nlh;
2905
2906 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
2907 if (nlh == NULL)
2908 return -EMSGSIZE;
2909
2910 um = nlmsg_data(nlh);
2911
2912 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
2913 um->id.spi = x->id.spi;
2914 um->id.family = x->props.family;
2915 um->id.proto = x->id.proto;
2916 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
2917 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
2918 um->new_sport = new_sport;
2919 um->old_sport = x->encap->encap_sport;
2920 um->reqid = x->props.reqid;
2921
2922 return nlmsg_end(skb, nlh);
2923 }
2924
2925 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
2926 __be16 sport)
2927 {
2928 struct net *net = xs_net(x);
2929 struct sk_buff *skb;
2930
2931 if (x->id.proto != IPPROTO_ESP)
2932 return -EINVAL;
2933
2934 if (!x->encap)
2935 return -EINVAL;
2936
2937 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
2938 if (skb == NULL)
2939 return -ENOMEM;
2940
2941 if (build_mapping(skb, x, ipaddr, sport) < 0)
2942 BUG();
2943
2944 return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
2945 }
2946
2947 static struct xfrm_mgr netlink_mgr = {
2948 .id = "netlink",
2949 .notify = xfrm_send_state_notify,
2950 .acquire = xfrm_send_acquire,
2951 .compile_policy = xfrm_compile_policy,
2952 .notify_policy = xfrm_send_policy_notify,
2953 .report = xfrm_send_report,
2954 .migrate = xfrm_send_migrate,
2955 .new_mapping = xfrm_send_mapping,
2956 };
2957
2958 static int __net_init xfrm_user_net_init(struct net *net)
2959 {
2960 struct sock *nlsk;
2961 struct netlink_kernel_cfg cfg = {
2962 .groups = XFRMNLGRP_MAX,
2963 .input = xfrm_netlink_rcv,
2964 };
2965
2966 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
2967 if (nlsk == NULL)
2968 return -ENOMEM;
2969 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
2970 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
2971 return 0;
2972 }
2973
2974 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
2975 {
2976 struct net *net;
2977 list_for_each_entry(net, net_exit_list, exit_list)
2978 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
2979 synchronize_net();
2980 list_for_each_entry(net, net_exit_list, exit_list)
2981 netlink_kernel_release(net->xfrm.nlsk_stash);
2982 }
2983
2984 static struct pernet_operations xfrm_user_net_ops = {
2985 .init = xfrm_user_net_init,
2986 .exit_batch = xfrm_user_net_exit,
2987 };
2988
2989 static int __init xfrm_user_init(void)
2990 {
2991 int rv;
2992
2993 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2994
2995 rv = register_pernet_subsys(&xfrm_user_net_ops);
2996 if (rv < 0)
2997 return rv;
2998 rv = xfrm_register_km(&netlink_mgr);
2999 if (rv < 0)
3000 unregister_pernet_subsys(&xfrm_user_net_ops);
3001 return rv;
3002 }
3003
3004 static void __exit xfrm_user_exit(void)
3005 {
3006 xfrm_unregister_km(&netlink_mgr);
3007 unregister_pernet_subsys(&xfrm_user_net_ops);
3008 }
3009
3010 module_init(xfrm_user_init);
3011 module_exit(xfrm_user_exit);
3012 MODULE_LICENSE("GPL");
3013 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
3014
kernel source for telekom puls (alcatel/mediatek)